Agreed. It sounds like you're both confused Choose one method and stick with it. Personally, here's what I would do:

- Leash tugging: Take him out to your front yard. As soon as he hits the end of the leash, quickly tug back and walk the opposite way. He will keep tugging. You keep tugging back and changing directions. Keep this fast and fluid. As well, you can also click/treat whenever he catches up to you. Repeat repeat repeat. Eventually, you can try this on regular walks. But you must build a solid foundation before you attempt to loose-leash-walk your daily walks.

- Nipping: It's excitement, not necessarily aggression. It could also be a little frustration, which leads to such behaviors as growling and nipping. It sounds like he's very excitable and that your mere presence is a reward for his play. Thus, if he's outside and you step foot outside and begins to jump/nip, immediately shut the door and walk back inside. Repeat repeat repeat. Eventually, Odin will realize that his jumping results in your disappearance. He will quickly learn to keep four paws on the ground. When this happens, you can throw him a toy and then continue play.

Just be completely firm and consistent, and he'll learn the rules quickly